Bit-stock



Patented Oct. 18,1881,

(No Model.)

W. A. IVES.

BIT STOCK.

0 m. wumn mn. 0. cv

Unrrnn TATES ATENT Carina.

WILLIAM A. IVES, OF NEW HAVEN, CONNECTICUT.

BIT-STOCK.

SPECIFICATION forming part of Letters Patent No. 248,470, dated October18, 1881.

Application filed April 16, 1881. (No model.) v

To all whom it may concern:

Be it known that I, WM. A. IVES, of New Haven, in the county of NewHaven and State of Connecticut, have invented a new Improvement inBit-Braces; and I do hereby declare the following, when taken inconnection with the accompanying drawings and the letters of referencemarked thereon, to be a full, clear, and exact description of the same,and which said drawings constitute part of this specification, andrepresent, in-

Figure 1, a side view; Fig. 2, sectional side view; Fig. 3, verticalcentral section through both jaws; Fig. 4, section on same line as Fig.3, showing the jaws as holdingthe bit; Fig. 5, vertical section of thesocket at right angles to the section 3; Fig. 6, section on line was ofFig. 5.

This invention relates to an improvement in that class of bit-braces inwhich is a stationary seat for the tip of the bit-tang, and a pair ofjaws arranged to grasp upon the shank of the bit, over the shoulder ofthe tang, to draw and hold it onto its seat, the object of thisinvention being to retain the jaws in a firm open position when not inuse, and also to insure their moving together to properly gripe and holdthe bit; and it consists in a socket threaded upon its exterior surfacewith radially-opposite slots, within which the griping-jaws arearranged, a stationary seat in the socket for the tip of the tang, thesaid two jaws hung to a slide in the socket below the seat, said slideresting upon a spring to force it outward, the said seat serving to openand hold the jaws open as they are forced outward by the spring,combined with an internally-threaded sleeve working upon the outside ofthe socket to force the jaws inward toward the tang-seat, and alsotoward each other, all as more fully hereinafter described.

A represents the arm of the bit-brace, to which the socket B isattached. This socket B is screw-threaded upon its outside, as seen inFig. 2, and has a longitudinal slot, a, diametrically through it, in theusual manner for this class of braces.

C is the sleeve, internally threaded to work upon the outside of thesocket, to operate upon the inclined backs of the jaws D Dinsubstantially the usual manner.

Centrally within the socket a bridge, (1, extends t'rom side to side, asseen in Figs. 3, 5, and 6. In this bridge d a cavity, 0, is made as aseat for the lower end of the bit-tang E, as seen in Fig. 4. and inbroken lines, Fig. 3. Below the bridge (I, and through the slot in thesocket, a slide, F, is arranged, seated upon a spring, G, the tendencyof which is to force the said slide upward. This slide has a recess inits upper side, into which the lower end of the jaws D set, and throughthe slide and lower end of the jaws a pin, I), is placed, which servesto secure the jaws to the slide. The hole through the jaws for the pinis slightly larger than the pin, so as to allow the requisite play ofthe jaws. At the outer end the inner faces of the jaws are provided withinternal projections or shoulders,f, to grasp over the shoulder of thetang, as seen in Fig. at. At the lower end of the jaws and above theirconnection with the slide F the inside of each jaw is inclined, as at n,upward and outward, and so that when the jaws are in their extremeoutward position, forced there by the spring G, the inclined surfaces astrike upon the under side of the bridge (Z and force the jaws not onlyto their outer position, but to their extreme open position, as seen inFig. 3. Held in this position against the bridge the outer end of thejaws are held back against the mouth of the sleeve, so that they remainin that position to receive the bit-tang, and do not have that freedomwhich permits them to tip inward, as in many bit-braces, and whichfreedom causes a difficulty or inconvenience in insorting the bit.

The operation of this brace is as follows: The jaws being open, as inFig. 3, the tang ot' the bit is introduced between thejaws, its tip setonto the seat or cavity a. The distance between the bridge and the endof the jaws in this position should be greater than the length i of thetang. When the bit has been thus inserted the sleeve is rotated to drawit onto the socket, and in so doing it bears upon the outer end ofthejaws, moving them inward against the shank of the bit, and so soon asthey come to a bearing on the shank of the bit they then are forcedinward toward the seat, compressing the spring Gr until they engage theshoulder of the tang, as seen in Fig. 4.. To release the bit, reversethe operation, in doing which the jaws are forced outward and open bythe spring G acting upon the slide F, as before described.

By this construction the jaws are positively brought together and cannotbe disarranged, and are always in the condition and position to readilyreceive and grasp the bit.

From the foregoing it will he understood that I do not broadly claim abit-brace having griping-jaws arranged to move both longitudinally andtoward each other; neither do I broadly claim, in combination with suchjaws, a sta tionary seat in the socket for the end of the tang, as such,I am aware, is not new; but

What I do claim is-- 1. In a bit-brace, the combination of thescrew-threaded socketB,1on gitudinally slotted and constructed with thebridge d, to form a seat for the tip of the tang, the slide F, arrangedto move longitudinally in the slot of the socket and below the bridge,the spring arranged to force the said slide toward the bridge, the jawsD D, hung upon apivot in the said slide, and

the internally-threaded sleeve arranged to be moved longitudinally onthe socket and to force the said jaws longitudinally inward and towardeach other, substantially as described.

2. In a bitbrace, the combination of the screw-threaded socket B,longitudinally slotted and constructed with the bridge d, to form avseat for the tip of the tang, the slide F, arranged to movelongitudinally in the slot of the socket and below the bridge, thespring arranged to force the said slide toward the bridge, thejaws D D,hung upon a pivot in the said slide, constructed with the inclines itupon their inner face, said inclines arranged to workagainstcorresponding points on the said bridge to open thejaws, and theinternally-threaded sleeve arranged to be moved longitudinally on thesocket and to force the said jaws longitudinally inward and toward eachother, substantially as described.

WM. A. IVES.

Vitnesses:

Joan E. EARLE, J. H. SHUMWAY.

